so I have couple of quick questions: 1. AC100 shared almost the same hardware spec with Nvidia Tegra 250 Developer Kit? 2. Re-partition AC100 internal storage still a hard requirement before install Gentoo? 3. Could you please provide an updated binary Gentoo kernel+initrd image for AC100?

Just a suggestion as I have no experience with this particular system. Also realize that cross-compiling for a target system is a different installation than using binaries, pre-existing packages or a pseudo-distro installation that some websites may offer.

IMHO, it is easier to use binaries and packages already created, if not a specific installation CD/usb install and get the board up and running. Building up an embedded system, via cross-compiling is what you should do after you gain some experience with that specific arm platform. Be careful not to mix ideas and web pages that are not compatible on the different installation approaches.

I'm sorry but i have no idea. My guide is for the tegra250 developer kit, i don't have an AC100 so i can't do anything for it since i don't know if it'll work, besides its setup is more complicated than the devkit.

Regarding your questions.

1. The devkit only has 512M of NAND. The devkit has an atheros AR6002 wifi, while the AC100 has a Ralink. 2. I don't know 3. See above

I'm cc'ing Hanno since he has an AC100 with gentoo running on it iirc. Also i'd suggest you join the IRC channel #ac100 at irc.freenode.net and ask there, there are some people running Gentoo.